James E. Altland
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View article: Phosphate solubilizing bacteria isolated from greenhouse ornamentals improve health and promote growth in French marigold ‘Durango Yellow’ grown in soilless substrate under phosphate limiting conditions
Phosphate solubilizing bacteria isolated from greenhouse ornamentals improve health and promote growth in French marigold ‘Durango Yellow’ grown in soilless substrate under phosphate limiting conditions Open
View article: Modified nutrient management protocol for optimum biomass production, nutritional quality, and flavor-related phytochemical properties of hydroponic-grown kale (Brassica oleracea)
Modified nutrient management protocol for optimum biomass production, nutritional quality, and flavor-related phytochemical properties of hydroponic-grown kale (Brassica oleracea) Open
Introduction Nutrient supply in hydroponic leafy green production is often not aligned with crop-specific requirements. Kale ( Brassica oleracea ‘Red Russian’) has been shown to exhibit higher nitrogen (N) demand than other leafy greens. C…
View article: Parsimonious models of root zone temperature in soilless substrates through ensemble machine learning
Parsimonious models of root zone temperature in soilless substrates through ensemble machine learning Open
View article: A Survey Analysis Comparing Perceptions of Plastic Use in Nurseries and Greenhouses in the United States
A Survey Analysis Comparing Perceptions of Plastic Use in Nurseries and Greenhouses in the United States Open
Plastic is extensively used in nursery and greenhouse operations. Concerns are growing about the potential release of plastic byproducts, such as microplastics and per- and poly-fluoroalkyl substances (PFAS), into water resources. The purp…
View article: Evaluation of Liquid Organic Fertilizers for Containerized Production under Controlled Environment
Evaluation of Liquid Organic Fertilizers for Containerized Production under Controlled Environment Open
Organic production is becoming increasingly popular among producers in controlled environment agriculture. However, selecting a suitable fertilizer for organic production can be complicated, as commercially available organic fertilizers ha…
View article: Macronutrient Solubility in Response to the pH of Soilless Container Substrates
Macronutrient Solubility in Response to the pH of Soilless Container Substrates Open
This study investigated the complex interactions between pH and nutrient availability in soilless substrates, focusing on how different nutrient solution formulations, substrate components, and liming materials influence macronutrient solu…
View article: Influence of Electrical Conductivity on Plant Growth, Nutritional Quality, and Phytochemical Properties of Kale (Brassica napus) and Collard (Brassica oleracea) Grown Using Hydroponics
Influence of Electrical Conductivity on Plant Growth, Nutritional Quality, and Phytochemical Properties of Kale (Brassica napus) and Collard (Brassica oleracea) Grown Using Hydroponics Open
Kale (Brassica napus) and collard (Brassica oleracea) are two leafy greens in the family Brassicaceae. The leaves are rich sources of numerous health-beneficial compounds and are commonly used either fresh or cooked. This study aimed to op…
View article: Evaluation of hydroponic systems for organic lettuce production in controlled environment
Evaluation of hydroponic systems for organic lettuce production in controlled environment Open
Organic farming methods, including the use of organic substrates, fertilizers, pesticides, and biological control, are gaining popularity in controlled environment agriculture (CEA) due to economic benefits and environmental sustainability…
View article: Growth, phytochemical concentration, nutrient uptake, and water consumption of butterhead lettuce in response to hydroponic system design and growing season
Growth, phytochemical concentration, nutrient uptake, and water consumption of butterhead lettuce in response to hydroponic system design and growing season Open
Two hydroponic system designs (nutrient film technique: NFT, and deep water culture: DWC) were set up in a climate-controlled greenhouse to compare growth, nutrients and water uptake patterns, yield and quality of lettuce (Lactuca sativa c…
View article: A Base Layer of Ferrous Sulfate-Amended Pine Bark Reduces Phosphorus Leaching from Nursery Containers
A Base Layer of Ferrous Sulfate-Amended Pine Bark Reduces Phosphorus Leaching from Nursery Containers Open
Phosphorus (P) fertilizers applied to container-grown nursery crops readily leach through pine bark-based substrates and can subsequently runoff and contribute to surface water contamination. The objectives of this research were to determi…
View article: Paclobutrazol Residues in Recirculated Water in Commercial Greenhouses
Paclobutrazol Residues in Recirculated Water in Commercial Greenhouses Open
Reusing irrigation water has technical, environmental, and financial benefits. However, risks are also associated with the accumulation of agrochemicals, in addition to ions, plant and food safety pathogens, and biofilm organisms. In this …
View article: Nutrient availability and plant phenological stage influence the substrate microbiome in container-grown Impatiens walleriana ‘Xtreme Red’
Nutrient availability and plant phenological stage influence the substrate microbiome in container-grown Impatiens walleriana ‘Xtreme Red’ Open
View article: Substrate Comparison for Tomato Propagation under Different Fertigation Protocols
Substrate Comparison for Tomato Propagation under Different Fertigation Protocols Open
Greenhouse tomato production faces multiple challenges, including the excessive use of nonrenewable substrates that are difficult to dispose of after use. Currently, most growers propagate tomatoes in rockwool, but there is an increasing d…
View article: The Pour-through Procedure Preferentially Extracts Substrate Solution from the Bottom of the Container in Conventional and Stratified Substrates
The Pour-through Procedure Preferentially Extracts Substrate Solution from the Bottom of the Container in Conventional and Stratified Substrates Open
Due to the widespread use of the pour-through extraction procedure in horticultural production and research, the objective of this study was to determine if the method is biased by preferentially extracting substrate solution near the bott…
View article: Overcoming the Nursery Industry Labor Shortage: A Survey of Strategies to Adapt to a Reduced Workforce and Automation and Mechanization Technology Adoption Levels
Overcoming the Nursery Industry Labor Shortage: A Survey of Strategies to Adapt to a Reduced Workforce and Automation and Mechanization Technology Adoption Levels Open
US nurseries are experiencing a workforce shortage that is expected to intensify. A mixed-mode survey of decision-makers representing the US nursery industry was conducted in 2021. The survey assessed practices used in 2020 to elicit a bet…
View article: Microbial Community Structure in Soilless Substrates Used for Nursery Crops
Microbial Community Structure in Soilless Substrates Used for Nursery Crops Open
Soilless substrates are widely used for plant cultivation. However, little is known about how soilless substrate components, plant growth, or their interactions impact microbial communities in soilless media. The objectives of this study w…
View article: Surveying North American Specialty Crop Growers’ Current Use of Soilless Substrates and Future Research and Education Needs
Surveying North American Specialty Crop Growers’ Current Use of Soilless Substrates and Future Research and Education Needs Open
Many specialty crop growers are transitioning high-value crops from in-ground production to soilless culture due to the diminishing availability of fumigants, increasing pest pressure, extreme weather, and the need for flexible production …
View article: Effect of Substrate Stratification Without Fine Pine Bark Particles on Growth of Common Nursery Weed Species and Container-grown Ornamental Species
Effect of Substrate Stratification Without Fine Pine Bark Particles on Growth of Common Nursery Weed Species and Container-grown Ornamental Species Open
Substrate stratification is a new research area in which multiple substrates, or the same substrate with differing physical properties, are layered within a container to accomplish a production goal, such as decreasing water use, nutrient …
View article: Evaluation of substrates for cucumber production in the Dutch bucket hydroponic system
Evaluation of substrates for cucumber production in the Dutch bucket hydroponic system Open
The Dutch bucket system is commonly used for production of high-wire crops such as tomatoes, peppers, and cucumbers in controlled environment agriculture. It is a hydroponic system that utilizes containers typically filled with perlite as …
View article: Growth and Quality Response of Four Container-grown Nursery Crop Species to Low-phosphorus Controlled-release Fertilizer
Growth and Quality Response of Four Container-grown Nursery Crop Species to Low-phosphorus Controlled-release Fertilizer Open
The amount of phosphorus (P) conventionally recommended and applied to container nursery crops commonly exceeds plant requirements, resulting in unused P leaching from containers and potentially contributing to surface water impairment. An…
View article: Effect of Substrate Stratification on Growth of Common Nursery Weed Species and Container-grown Ornamental Species
Effect of Substrate Stratification on Growth of Common Nursery Weed Species and Container-grown Ornamental Species Open
Substrate stratification is a method of filling nursery containers with “layers” of different substrates, or different textures of the same substrate. Recently, it has been proposed as a means to improve drainage, substrate moisture dynami…
View article: The Pour-Through Procedure for Monitoring Container Substrate Chemical Properties: A Review
The Pour-Through Procedure for Monitoring Container Substrate Chemical Properties: A Review Open
The pour-through procedure is a nondestructive method commonly used by horticultural crop producers and research scientists to measure chemical properties and nutrient availability in container substrates. It is a method that uses water as…
View article: Substrate Stratification: Layering Unique Substrates within a Container Increases Resource Efficiency without Impacting Growth of Shrub Rose
Substrate Stratification: Layering Unique Substrates within a Container Increases Resource Efficiency without Impacting Growth of Shrub Rose Open
Nurseries rely on soilless substrates to provide suitable growing media for container grown crops. These soilless substrates have been developed to readily drain water to prevent issues with waterlogging and associated soil-borne disease. …
View article: Photosynthesis, Biomass Production, Nutritional Quality, and Flavor-Related Phytochemical Properties of Hydroponic-Grown Arugula (Eruca sativa Mill.) ‘Standard’ under Different Electrical Conductivities of Nutrient Solution
Photosynthesis, Biomass Production, Nutritional Quality, and Flavor-Related Phytochemical Properties of Hydroponic-Grown Arugula (Eruca sativa Mill.) ‘Standard’ under Different Electrical Conductivities of Nutrient Solution Open
Arugula (Eruca sativa) is cultivated using hydroponic techniques in greenhouses to fulfill high year-round demand, but its nutrient management in hydroponic production has not yet been standardized, potentially leading to limited quality a…
View article: Petunia (Petunia ×hybrida) Cultivars Vary in Silicon Accumulation and Distribution
Petunia (Petunia ×hybrida) Cultivars Vary in Silicon Accumulation and Distribution Open
Silicon (Si) is a plant-beneficial element that can alleviate the effects of abiotic and biotic stress. Plants are typically classified as Si accumulators based on foliar Si concentrations (≥1% Si on a dry weight basis for accumulators). B…
View article: pH Buffering in Pine Bark Substrates as a Function of Particle Size
pH Buffering in Pine Bark Substrates as a Function of Particle Size Open
Stability of substrate pH in container-grown crops is important for proper nutrient management. The objective of this research was to determine the pH buffering capacity of pine bark substrates as a function of particle size and compare th…
View article: Salt Tolerance of Hydrangea Plants Varied among Species and Cultivar within a Species
Salt Tolerance of Hydrangea Plants Varied among Species and Cultivar within a Species Open
A greenhouse study was conducted to assess the relative salt tolerance of 11 cultivars of hydrangea: Hydrangea macrophylla ‘Ayesha’, ‘Emotion’, ‘Mathilda Gutges’, ‘Merritt’s Supreme’ and ‘Passion’; H. paniculata ‘Interhydia’ and ‘Bulk’; H.…
View article: Storage Procedures Affect pH, Electrical Conductivity, and Nutrient Concentrations of Pour-through Leachate from Pine Bark and Peat-based Substrates
Storage Procedures Affect pH, Electrical Conductivity, and Nutrient Concentrations of Pour-through Leachate from Pine Bark and Peat-based Substrates Open
The pour-through (PT) method is used in greenhouse and nursery production to monitor nutrient availability in soilless substrates. Efficacy of this method is based on the assumption that chemical properties of extracted solutions remain st…
View article: Effects of Electrical Conductivity, pH, and Foliar Application of Calcium Chloride on Yield and Tipburn of Lactuca sativa Grown Using the Nutrient–Film Technique
Effects of Electrical Conductivity, pH, and Foliar Application of Calcium Chloride on Yield and Tipburn of Lactuca sativa Grown Using the Nutrient–Film Technique Open
Yield reduction resulting from high temperatures and tipburn are common issues during the summer for hydroponically grown lettuce using the nutrient–film technique (NFT). We investigated the yield and degree of tipburn of lettuce ‘Red Butt…
View article: Dolomite and Micronutrient Fertilizer Affect Phosphorus Fate When Growing Crape Myrtle in Pine Bark
Dolomite and Micronutrient Fertilizer Affect Phosphorus Fate When Growing Crape Myrtle in Pine Bark Open
Soilless substrates are routinely amended with dolomite and sulfate-based micronutrients to improve fertility, but the effect of these amendments on phosphorous (P) in substrate pore-water during containerized crop production is poorly und…